KR101710709B1 - A viscous damper that prevents leakage of viscous fluid - Google Patents

Abstract

The present invention relates to a viscous damper having a structure for preventing leakage of oil, damping vibration applied to a structure by using the viscosity of a fluid and comprising a cylinder part, a fixed end, an expansion joint part, a piston part and a valve member. The cylinder part has one opened end part. The fixed end is spaced from one end of the cylinder part while facing the end. A separation space between the cylinder part and the fixed end and a chamber area including the interior of the cylinder part are filled with viscous fluid. The expansion joint part connects one end of the cylinder part to the fixed end to allow the chamber area to be sealed from the outside and is expanded in accordance with the relative movement between the cylinder part and the fixed end. The piston part includes: a piston head inserted into the cylinder part to be slid and dividing the chamber area into a first chamber area and a second chamber area; and a piston rod connecting the fixed end with the piston head. The valve member divides the first chamber area, which protrudes from an inner surface of the cylinder part toward the piston rod to be in contact with the fixed end, into a first section and a second section and is spaced from the piston rod to form a gap. According to the present invention, when viscous fluid existing in the second section in contact with the piston head is pressurized, the viscous fluid restrictively moves to the first section in contact with the fixed end through the gap.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a viscous damper,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a viscous damper, and more particularly, to a viscous damper having a leakage preventive structure that attenuates vibrations applied to structures such as bridges and large buildings by utilizing fluidity of a viscous fluid having a predetermined viscosity.

There are steel dampers (Friction Damper), Friction Damper (Viscous Damper), and Viscous Damper, which are applied to seismic reinforcement methods of steel structures such as bridges and large buildings or concrete structures.

Among them, the viscous damper generally comprises a cylindrical cylinder body whose one end is shielded, a cylinder head cap which shields the other end of the cylinder body, a piston head which is inserted into the cylinder body, And a piston rod which is fixed to an external structure.

The viscous damper is a device for attenuating vibrations using the principle that the viscous fluid filled in the cylinder body moves rapidly to the peripheral gaps of the reciprocating piston in the cylinder body and the vibration energy is converted into frictional heat. The viscous dampers are maintenance-free because there is no need for additional auxiliary equipment or external power, and there is no change in performance without damage to viscous damper and leakage of viscous fluid even after a large earthquake.

In the viscous damper, a sealing member is interposed between the cylinder body and the cylinder head cap so as to prevent the viscous fluid filled in the cylinder body from leaking out. The viscous damper is fastened to the inner peripheral surface of the through hole of the cylinder head cap through which the piston head passes, Member.

The structure and sealing method of such a viscous damper basically have the problem that the viscous fluid can be leaked to the outside because the bolt is loosened, the sealing member or the packing member is worn out, and a clearance may be generated. The viscous fluid is the most important factor to attenuate vibration energy. If viscous fluid is leaked, the damping function of the viscous damper will be degraded.

On the other hand, when the gap between the structures is changed slowly due to external temperature change, the viscous damper immediately reacts to the vibration, and the vibration damper is contracted and contracted at low speed.

On the other hand, if the gap between the structures changes rapidly due to wind and earthquakes, the viscous damper will expand and contract at high speed to attenuate the vibration until a certain speed, but after a certain speed, the viscous fluid characteristics (intermediate state between liquid and solid, The viscous damper does not react immediately, and the vibration response is slowed down at high speed after the response time.

When the vibration is applied to the structure requiring a response response time, the viscous damper and the structure receive impact force due to the vibration during the response time, so that the durability of the viscous damper and the safety of the structure are deteriorated.

Korean Registered Patent No. 10-0476439 (registered on March 16, 2005, name of invention: seismic device for building structure)

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a viscous damper which is capable of preventing leakage of viscous fluid to the outside, .

According to an aspect of the present invention, there is provided a viscous damper having a leakage preventive structure, including: a cylinder part having an opening at one end; A fixed end 200 spaced from the one end of the cylinder part 100 and disposed to face each other; The viscous fluid f is filled in the chamber region C including the spacing space sp between the cylinder portion 100 and the fixed end 200 and the interior portion 101 of the cylinder portion 100, The one end of the cylinder part 100 and the fixed end 200 are connected to each other so that the chamber area C is hermetically sealed from the outside, A stretching joint 300; A piston head 410 slidably inserted into the cylinder part 100 to divide the chamber area C into a first chamber area C1 and a second chamber area C2; 200) and a piston head (420) connecting the piston head (410); And a first chamber area C1 protruding from the inner side surface of the cylinder part 100 toward the piston rod 420 and contacting the fixed end 200 is defined as a first chamber C1a and a second chamber C1b, And a valve member 500 separating the piston head 410 from the piston rod 420 and forming a clearance t with a predetermined distance from the piston rod 420. The piston head 410 is in contact with the piston head 420, The viscous fluid f1b moves to the first region C1a which is in contact with the fixed end 200 through the gap t when the viscous fluid f1b existing in the fixed portion C1b is pressed, .

In the viscous damper having the leakage preventive structure according to the present invention, the plate member 500 includes an inclined surface 501 which is in contact with the first zone C1a and is inclined toward the second zone C1b, And a curved surface 502 that contacts the second zone C1b and is curved toward the first zone C1a.

In the viscous damper having the leakage preventing structure according to the present invention, the fixed end 200 includes a first fixed end 210 coupled to the structure 10 receiving the vibration w, And a buffer block 230 made of an elastic material interposed between the first fixed end 210 and the second fixed end 220. The vibrations w The buffer block 230 is expanded and contracted to primarily absorb the vibration w and the elastic deformation of the expansion joint 300 and the fixed block 200 can be suppressed, The viscous fluid (f) can absorb the vibration (w).

In the viscous damper having the leakage preventive structure according to the present invention, the structure 10 is provided with a pair of support brackets 21 spaced from each other on the fixed shaft X1 parallel to the side surface of the structure 10, And the pair of support brackets 21 are each formed with a fastening hole 21a having a center on the fastening axis X1 and the first fastening end 210 Is inserted into the central portion of the coupling rib 211 corresponding to the center of the coupling hole 21a and inserted into the coupling rib 211 between the pair of support brackets 21, And the bearing body 212 is formed to have a size corresponding to that of the coupling hole 21a so as to be in contact with the bushing The bush 30 is inserted into the bush hole 21a through the fastening hole 21a, As the said bearing member (212) free to rotate as the inserted ipgong (212a) has a hollow axis (X2) of the bushing insertion hole (212a) can be matched to the fixed axis (X1).

According to the viscous damper having the leakage preventive structure of the present invention, the viscous damper can be prevented from leaking to the outside while the damping function of the viscous damper is maintained as it is, and the damping function of the buffer It is possible to prevent the durability of the stretch joint from being deteriorated through the block.

Particularly, since the buffer member primarily absorbs the vibration and preliminarily pressurizes the viscous fluid, the response time of the viscous damper can be shortened or eliminated, thereby ensuring durability of the viscous damper and safety of the structure.

Further, it is possible to prevent the durability of the extensible joint portion from being lowered by providing the plate member in the first chamber region so that the pressure in the first region where the expansion / contraction portion is located is increased stepwise, By making the flow rate of the viscous fluid passing through the gap different, it is possible to prevent the durability of the expansion joint from being lowered, and the viscous damper can be fixed smoothly to the structure without being affected by various errors in the construction .

1 is a schematic view showing a cross section of a viscous damper having a leakage preventing structure according to an embodiment of the present invention,
FIG. 2 is a partially enlarged view showing that the piston head included in the viscous damper having the oil leakage preventing structure of FIG. 1 presses the first chamber region,
Fig. 3 is a partially enlarged view showing that the piston head included in the viscous damper having the oil leakage preventing structure of Fig. 1 presses the second chamber region,
FIG. 4 is a view partially showing a process of absorbing vibration by the viscous damper having the oil leakage prevention structure of FIG. 1,
FIG. 5 is a view illustrating a process in which a viscous damper having the oil leakage prevention structure of FIG. 1 is coupled to an anchorage fixed to a structure.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a viscous damper having a leakage preventing structure according to the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

FIG. 1 is a schematic view showing a cross-section of a viscous damper having a leakage preventing structure according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of a viscous damper having a leak- FIG. 3 is a partially enlarged view showing that the piston head included in the viscous damper having the oil leakage preventing structure of FIG. 1 presses the second chamber region, and FIG. 4 is a cross- FIG. 5 is a view showing a process in which a viscous damper having a leakage preventing structure of FIG. 1 absorbs vibration, and FIG. 5 is a view illustrating a process of coupling a viscous damper having a leakage preventing structure of FIG. 1 to an anchorage .

1 to 5, a viscous damper having a leakage preventing structure according to an exemplary embodiment of the present invention uses fluidity of a viscous fluid having a predetermined viscosity to attenuate vibration applied to a structure such as a bridge or a large building The apparatus includes a cylinder unit 100, a fixed end 200, a stretch joint 300, a piston unit 400, and a plate member 500.

The cylinder portion 100 is provided with an inner hollow cylindrical shape, one end is open and the other end is shielded. The cylinder part 100 is coupled to a structure (11, corresponding to a bridge top plate) of one of two structures that generate vibrations relatively to each other and is disposed in parallel to the vibration direction. And are arranged to face one another at a distance from each other. The fixed end 200 is coupled to the other structure (10, corresponding to the pier) of the two structures and forms a spacing space sp between the cylinder portions 100.

The viscous fluid f is filled in the chamber region C including the inside 101 of the cylinder portion 100 and the spacing space sp. The viscous fluid f reciprocates between the piston heads 410, which will be described later, to absorb the vibration energy while converting the vibration energy into frictional heat.

The expansion joint 300 connects the one end of the cylinder part 100 and the fixed end 200 so that the chamber area C is hermetically sealed from the outside and the relative movement between the cylinder part 100 and the fixed end 200 . One end of the stretch joint portion 300 is joined to the cylinder portion 100 and the other end is joined to the fixed end 200 to completely seal the chamber region C from the outside.

The stretch joint portion 300 can be made of a material having elasticity that can be stretched or shrunk in the vibration direction, has a low reactivity with the viscous fluid (f), and has a relatively good bonding property to the cylinder portion (100). Typically, a high-strength corrugated tube with a corrugated tube of stainless steel tube and Teflon tube can be applied.

A conventional viscous damper (not shown) has a structure in which the other end of the cylinder portion is shielded by a cylinder head cap, and a through hole is formed in the cylinder head cap so that the piston rod can pass through. The clearance between the cylinder portion and the cylinder head cap, and the gap between the piston rod and the through hole, respectively, have a structural limitation that the viscous fluid must leak.

In contrast to this, in the present embodiment, the other end of the cylinder part 100, which may cause a leakage problem, is completely opened, and the expansion joint 300 is provided between the other end of the cylinder part 100 and the fixed end 200 It is the structure introduced. That is, by providing a space in which the stretch joint 300 can accommodate the change in the distance between the cylinder 100 and the fixed end 200 and at the same time the viscous fluid f can be filled, the damping function of the viscous damper It is possible to prevent leakage of the viscous fluid f to the outside while keeping it intact.

However, the expansion joint 300 is vulnerable to fatigue due to repeated expansion and contraction, and is vulnerable to a momentary impact force due to vibration. In order to overcome this, the fixed end 200 includes a first fixed end 210 coupled to the structure 10 receiving the vibration w as shown in FIG. 4, and a second fixed end 210 coupled to the second fixed end 210, And a buffer block 230 made of an elastic material interposed between the first fixed end 210 and the second fixed end 220.

When the relative movement between the cylinder part 100 and the fixed end 200 occurs due to the vibration w, the buffer block 230 is expanded and contracted to primarily absorb the vibration w and the expansion joint 300 and the viscous fluid (f) absorbs the vibration (w) secondarily. It is preferable that the buffer block 230 has a modulus of elasticity that is smaller than the modulus of elasticity of the expansion joint 300 so that the vibration can be smoothly absorbed into the damping block 230. [

In this manner, the buffer block 230 acts to prevent the durability of the expansion joint 300 from deteriorating, and also acts as follows.

The viscous damper does not directly react to vibration (w) due to the characteristic of the viscous fluid (f) filled therein, as described in the background art, and reacts after the response time of the instant response to attenuate vibration (w). When a strong vibration (w) requiring a response time is generated due to a strong earthquake, the vibration (w) is not attenuated during the response time of the structure, and the viscous damper and the structure receive the impact force due to the vibration (w) . The durability of the viscous damper and the safety of the structure can be reduced accordingly.

In this embodiment, when a high-intensity vibration w requiring a response response time is transmitted to the structures 10 and 11, the buffer block 230 is expanded and contracted to primarily absorb the vibration w, The viscous damper can be shortened or eliminated due to the preliminary pressurization of the viscous fluid f filled in the region C. [ This means that the durability of the viscous damper and the safety of the structure can be secured.

1, the piston part 400 is slidably inserted into the cylinder part 100 to divide the chamber area C into a first chamber area C1 and a second chamber area C2, And a piston rod 420 connecting the fixed end 200 and the piston head 410. [

There is no problem when the piston head 410 presses the second chamber region C2 but when the piston head 410 presses the first chamber region C1 which is sealed by the retraction joint 300 Can be a problem. This is because the extensible joint part 300 has to be made of a material and structure that can be stretched and contracted so that the strength is relatively weak as compared with the cylinder part 100. When the piston head 410 presses the first chamber area C1, The pressure of the first chamber region C1 instantaneously rises and the expansion / contraction of the expansion / contraction portion 300 is transmitted to the portion 300 as it is.

In order to prevent this, the viscous damper having the oil leakage prevention structure according to the present embodiment includes the valve member 500.

2 or 3, the plate member 500 includes a first chamber region C1 protruding from the inner surface of the cylinder portion 100 toward the piston rod 420 and contacting the fixed end 200, The first section C1a and the second section C1b are separated from each other by a predetermined distance from the piston rod 420 to form an annular gap t.

When the piston head 410 presses the viscous fluid f1b present in the second region C1b in contact with the piston head 410 as shown in Fig. 2, the viscous fluid f1b is subjected to flow resistance, And moves to the first region C1a contacting the fixed end 200 through the gap t. Accordingly, the pressure in the first zone C1a in which the contract portion 300 is present does not rise instantaneously but increases stepwise.

The valve member 500 includes an inclined surface 501 contacting the first portion C1a and inclined toward the second portion C1b and an inclined surface 501 contacting the second portion C1b and curved toward the first portion C1a And a curved surface 502 formed thereon.

This is because the flow rate of the viscous fluid f passing through the gap t is made different according to the flow direction of the viscous fluid f so that the durability of the expansion joint 300 is not lowered, When the piston head 420 presses the first chamber region C1 as shown, some of the viscous fluid f1b present in the second region C1b flows in a direction away from the gap along the curved surface 502 And the remaining one passes through the gap t and moves to the first region C1a so that the flow rate of the viscous fluid f moving from the second region C1b to the first region C1a is relatively small.

Conversely, when the piston head 420 presses the second chamber region C2 as shown in FIG. 3, a portion of the viscous fluid f1a present in the first region C1a is spaced along the slope 501 flows through the gap t and into the second zone C1b so that the flow rate of the viscous fluid f moving from the first zone C1a to the second zone C1b is relatively high, More.

That is, when the piston head 420 presses the first chamber region C1, the flow rate of the viscous fluid f is controlled so that the pressure in the first region C1a in which the expansion joint 300 exists is not rapidly increased When the piston head 420 presses the second chamber area C2 relatively, the viscous fluid f1a existing in the first area C1a is quickly moved to the second area C1b where the space widens And relatively increases the flow rate of the viscous fluid f so that it can flow backward to fill the second zone C1b.

5, the structure 10 includes a pair of support brackets 21 spaced from each other on the fixed shaft X1 parallel to the side surface of the structure 10, The anchorage 20 is fixed.

A pair of support brackets 21 are respectively formed with fastening holes 21a having a center on the fastening axis X1 and a bush 30 is inserted in a central portion of the fastening ribs 211 provided on the fastening end 200. [ The bush insertion hole 212a is formed to have a size corresponding to the fastening hole 21a.

The horizontal error of the anchorage 20, the hole 21a of the anchorage 20, and the hole machining of the bush insertion hole 212a in the process of fixing the engagement rib 211 between the pair of support brackets 21, The fixed axis X1 and the hollow axis X2 can be displaced from each other due to an error or the like. In this case, the bush 30 is subjected to severe friction during insertion, or it is caught by a step st formed between the fastening hole 21a and the bush inserting hole 212a, which increases the difficulty in the construction.

The first fixed end 210 is provided with a coupling rib 211 inserted between the pair of support brackets 21 and a coupling rib 211 formed at a central portion of the coupling rib 211 corresponding to the center of the coupling hole 21a And a bearing body 212 that is inserted into the outer circumferential surface of the outer circumferential surface of the outer circumferential surface of the outer circumferential surface of the outer circumferential surface of the outer circumferential surface of the outer circumferential surface of the outer circumferential surface of the outer circumferential surface of the outer circumferential surface, 212a are formed to have sizes corresponding to the fastening holes 21a.

As the bush 30 is inserted into the bush insertion hole 212a through the fastening hole 21a, the bearing body 212 is freely rotated so that the hollow shaft X2 of the bush inserting hole 212a is inserted into the fixed shaft X1 . This makes it possible to fix the viscous damper to the structure smoothly regardless of various errors occurring in the construction process of the viscous damper.

The viscous damper having the leak preventive structure according to the present invention constructed as described above can fundamentally prevent the viscous fluid from leaking to the outside while maintaining the damping function of the viscous damper intact, It is possible to prevent the durability of the extensible joint portion from being deteriorated through the buffer block interposed between the two portions. Particularly, since the cushioning member primarily absorbs vibration and preliminarily pressurizes the viscous fluid, the response time of the viscous damper can be shortened or extinguished, whereby the durability of the viscous damper and the safety of the structure can be secured Can be obtained. Further, it is possible to prevent the durability of the extensible joint portion from being lowered by providing the plate member in the first chamber region so that the pressure in the first region where the expansion / contraction portion is present is increased stepwise, By reducing the flow rate of the viscous fluid passing through the gap, it is possible to prevent the durability of the expansion joint from being deteriorated and the bearing body into which the bush is inserted can freely rotate during the construction process of the bush, The viscous damper can be smoothly fixed to the structure.

The scope of the present invention is not limited to the above-described embodiments and modifications, but can be implemented in various forms of embodiments within the scope of the appended claims. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.

100:
200: fixed end
300: stretching pussy
400: piston part
500:

Claims (4)

A cylinder part (100) having one end opened;
A fixed end 200 spaced from the one end of the cylinder part 100 and disposed to face each other;
The viscous fluid f is filled in the chamber region C including the spacing space sp between the cylinder portion 100 and the fixed end 200 and the interior portion 101 of the cylinder portion 100, The one end of the cylinder part 100 and the fixed end 200 are connected to each other so that the chamber area C is hermetically sealed from the outside, A stretching joint 300;
A piston head 410 slidably inserted into the cylinder part 100 to divide the chamber area C into a first chamber area C1 and a second chamber area C2; 200) and a piston head (420) connecting the piston head (410); And
The first chamber area C1 protruding from the inner side of the cylinder part 100 toward the piston rod 420 and contacting the fixed end 200 is divided into a first zone C1a and a second zone C1b And a plate member (500) which forms a gap (t) at a predetermined distance from the piston rod (420)
When the piston head 410 presses the viscous fluid f1b present in the second region C1b in contact with the piston head 410 the viscous fluid f1b is restricted Is moved to a first zone (C1a) in contact with the fixed end (200). The method according to claim 1,
The plate member 500 includes a slope 501 contacting the first zone C1a and inclined toward the second zone C1b and a second zone C1b contacting the second zone C1b, And a curved surface (502) formed to be curved toward the center portion of the viscous damper. The method according to claim 1,
The fixed end 200 includes a first fixed end 210 coupled to the structure 10 receiving the vibration w, a second fixed end 220 coupled to the extended portion 300, And a buffer block 230 made of an elastic material interposed between the first fixed end 210 and the second fixed end 220,
When the relative movement between the cylinder part 100 and the fixed end 200 occurs due to the vibration w, the buffer block 230 is expanded and contracted to primarily absorb the vibration w, Wherein the viscous fluid (300) and the viscous fluid (f) absorb the vibration (w). The method of claim 3,
The anchorage 20 is fixed to the structure 10 with a pair of support brackets 21 facing each other on the fixed shaft X1 parallel to the side surface of the structure 10,
The pair of support brackets (21) are each formed with a fastening hole (21a) having a center on the fastening axis (X1)
The first fixed end 210 includes an engaging rib 211 inserted between the pair of support brackets 21 and a second engaging rib 211 inserted into the center of the engaging rib 211 corresponding to the center of the engaging hole 21a And a bearing body (212) formed on the outer surface of the outer circumferential surface, which is in contact with the engaging rib (211), and is spherically engaged with the engaging rib (211)
The bearing body 212 has a bush insertion hole 212a having a size corresponding to the coupling hole 21a and into which the bush 30 is inserted,
As the bush 30 is inserted into the bush insertion hole 212a through the coupling hole 21a, the bearing body 212 is freely rotated and the hollow shaft X2 of the bush insertion hole 212a is rotated And is fixed to the fixed shaft (X1).

Images